Near-IR telecommunication diode laser based double-pass QEPAS sensor for atmospheric CO2 detection
Near-IR telecommunication diode laser based double-pass QEPAS sensor for atmospheric CO2 detection
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DOI：
10.1088/1054-660x/25/12/125601
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发表时间：
2015-11
期刊：
影响因子：
1.2
通讯作者：
H. Zheng;L. Dong;X. Liu;Y. Liu;H. Wu;W. Ma;L. Zhang;W. Yin;S. Jia
中科院分区：
文献类型：
--
作者：
H. Zheng;L. Dong;X. Liu;Y. Liu;H. Wu;W. Ma;L. Zhang;W. Yin;S. Jia
A novel double pass quartz enhanced photoacoustic spectroscopy (QEPAS) sensor for atmospheric CO2 detection is developed by use of a 1.5 μm telecommunication diode laser. A low-cost high-reflection concave mirror is positioned behind a traditional QEPAS based acoustic detection module to enhance the absorption optical path and improve the detection sensitivity. The obtained minimum detection limit is 29 ppmV for 1 s averaging time which corresponds to a normalized noise equivalent absorption coefficient (NNEA, 1σ) of 2.2×10−9 cm−1⋅W⋅Hz−12 ?>. With a 247 s averaging time, it demonstrates an ultimate detectable sensitivity of 1.74 ppmV.
